fix(cli,hub): resolve typecheck errors in codex reasoning effort (#432)

* fix(cli,hub): resolve typecheck errors in codex reasoning effort and notification test

- Cast `getModelReasoningEffort()` return (string | null) to
  `ReasoningEffort | undefined` at three call sites in
  codexLocalLauncher.ts and runCodex.ts where the narrower type is
  expected.
- Add missing `modelReasoningEffort: null` default in
  notificationHub.test.ts to satisfy the Session type contract.

These errors were introduced in 79a13d2 and have been failing CI on
main since 2026-04-10.

* fix(cli): add missing getModelReasoningEffort to test mock session

The test stub in codexLocalLauncher.test.ts was missing the
getModelReasoningEffort method added in 79a13d2, causing runtime
TypeError in CI.

cli/src/codex/codexLocalLauncher.test.ts

@@ -79,6 +79,7 @@ function createSessionStub(permissionMode: 'default' | 'read-only' | 'safe-yolo'
                 }
             },
             getPermissionMode: () => permissionMode,
+            getModelReasoningEffort: () => null,
             onSessionFound: () => {},
             sendSessionEvent: (event: { type: string; message?: string }) => {
                 sessionEvents.push(event);

cli/src/codex/codexLocalLauncher.ts

@@ -1,5 +1,6 @@
 import { logger } from '@/ui/logger';
 import { codexLocal } from './codexLocal';
+import type { ReasoningEffort } from './appServerTypes';
 import { CodexSession } from './session';
 import { createCodexSessionScanner } from './utils/codexSessionScanner';
 import { convertCodexEvent } from './utils/codexEventConverter';
@@ -42,7 +43,7 @@ export async function codexLocalLauncher(session: CodexSession): Promise<'switch
             await codexLocal({
                 path: session.path,
                 sessionId: resumeSessionId,
-                modelReasoningEffort: session.getModelReasoningEffort() ?? undefined,
+                modelReasoningEffort: (session.getModelReasoningEffort() ?? undefined) as ReasoningEffort | undefined,
                 onSessionFound: handleSessionFound,
                 abort: abortSignal,
                 codexArgs,

cli/src/codex/runCodex.ts

@@ -82,7 +82,7 @@ export async function runCodex(opts: {
         }
         const sessionModelReasoningEffort = sessionInstance.getModelReasoningEffort();
         if (sessionModelReasoningEffort !== undefined) {
-            currentModelReasoningEffort = sessionModelReasoningEffort ?? undefined;
+            currentModelReasoningEffort = (sessionModelReasoningEffort ?? undefined) as ReasoningEffort | undefined;
         }
         sessionInstance.setPermissionMode(currentPermissionMode);
         sessionInstance.setModel(currentModel ?? null);
@@ -106,7 +106,7 @@ export async function runCodex(opts: {
         }
         const sessionModelReasoningEffort = sessionWrapperRef.current?.getModelReasoningEffort();
         if (sessionModelReasoningEffort !== undefined) {
-            currentModelReasoningEffort = sessionModelReasoningEffort ?? undefined;
+            currentModelReasoningEffort = (sessionModelReasoningEffort ?? undefined) as ReasoningEffort | undefined;
         }
         const sessionCollaborationMode = sessionWrapperRef.current?.getCollaborationMode();
         if (sessionCollaborationMode) {

hub/src/notifications/notificationHub.test.ts

@@ -58,6 +58,7 @@ function createSession(overrides: Partial<Session> = {}): Session {
         thinking: false,
         thinkingAt: 0,
         model: null,
+        modelReasoningEffort: null,
         effort: null,
         ...overrides
     }